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We explore the formation of cosmic string Y-junctions when strings of twodifferent types collide, which has recently become important since stringtheory can yield cosmic strings of distinct types. Using a model containing twotypes of local U(1) string and stable composites, we simulate the collision oftwo straight strings and investigate whether the dynamics matches thatpreviously obtained using the Nambu-Goto action, which is not strictly validclose to the junction. We find that the Nambu-Goto action performs onlymoderately well at predicting when the collision results in the formation of apair of Y-junctions (with a composite string connecting them). However, we findthat when they do form, the late time dynamics matches those of the Nambu-Gotoapproximation very closely. We also see little radiative emission from theY-junction system, which suggests that radiative decay due to bridge formationdoes not appear to be a means via which a cosmological network of such stringwould rapidly lose energy.

Cosmic string Y-junctions: a comparison between field theoretic and Nambu-Goto dynamics